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Postfix Documentation
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Using mirrored databases

Sites that have a need for multiple mail exchangers may enjoy the convenience of using a networked mailer database, but do not want to introduce a single point of failure to their system.

For this reason we've included the ability to have Postfix reference multiple hosts for access to a single pgsql map. This will work if sites set up mirrored pgsql databases on two or more hosts.

Whenever queries fail with an error at one host, the rest of the hosts will be tried in random order. If no pgsql server hosts are reachable, then mail will be deferred until at least one of those hosts is reachable.

Postfix Documentation
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